The mystery first name of a student in the class does not begin with a, b, c, d, e, or f. the names first letter comes before s, t, u, v, and w. the students whose names start with j, k, l, m, and n are not it. all letters from o through q are not it. x, y, z and g, h, i are not it. what is the first letter of the mystery name? explain how you completed the list.